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P0108 - Manifold Absolute Pressure (Map)/Barometric Pressure (BARO) Sensor High

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2007 Mercury Mountaineer, 2007 Mercury Monterey, 2007 Mercury Montego, 2007 Mercury Milan, and 2007 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.
P0108 - MANIFOLD ABSOLUTE PRESSURE (MAP)/BAROMETRIC PRESSURE (BARO) SENSOR HIGH

Description:  Sensor operating voltage is greater than 5 volts (VREF). As a result it failed above the maximum allowable calibrated parameter.
Possible Causes: 
  • VREF shorted to VPWR
  • MAP signal shorted to VPWR
  • VREF should be less than 6.0 volts. The PID reading is in frequency/volts
  • Open circuit
Diagnostic Aids:  VREF should be greater than 4.0 volts. The PID reading is in frequency/volts.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All refer to PINPOINT TEST DM .